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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee354d47c888f6328b500bb1f1b472e665e9553b470e074f59f9edca74fa654c' 
  AND token = 'FaLMg9ZHAZysZE2T8LzFB1qpUk1Xa3e4p5IajgjR+/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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