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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91422086542d9da251dff068ec6fd48aebbc31c83e9f691a92f5a8baf4a1afc7' 
  AND token = 'xn9j8J2owGMhjVjWL9Eznljn+bDwUzeFeyaWjPsu+k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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