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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcde33f2404440500aa8e7a2c89a860b443b2b0761d9b4ffb87ebc7683cdefc8' 
  AND token = 'T1Pds5KJ1/9dhoMv+xY6I59vkgtjHYisNAj4CeebyUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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