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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e0ed278081703abf44c0cfc334cba5fb0ffb8f8594820044c732173cf90f48' 
  AND token = 'BAyHG1c0LQnqemLjpMbHvXxJSX3EQedoETFg/c98GlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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