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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b7f263dbb8cba930641bd90a83074b5349417b9a7c36183bf4b66c0a0e4623' 
  AND token = 'eb28eKnqNOLmHAFAKkYEABVHeq+ymH7FskLSGc7Csz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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