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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b876c9fdc6f2507e11c4235477c3a36f72e15ca4f60828c2999b3e772b81d4bf' 
  AND token = 'wLBW7Iofh3K02Ah+57wwHROZ7G8bp/92RaR/0ntqRvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}