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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8923c770656e53e705e32b6f7a773a82633f6dd1d5a6b6dbea33e18c2100c31' 
  AND token = 'qDp3hG8vzL0lAfbfaMxziIaidcM4w+SUXc5UH1LdlWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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