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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac93d0db03e5ac6215b155c977d7b9eb4952fabef9364bf2c148b6f8b462550' 
  AND token = 'BW88mYWYIE6kXhbBtX7RJM3UtLALsLNB/vsOpETLhvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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