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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da442da512d34051a42f70e3635236cfffa901b4f94cf26ceee92053b54cb739' 
  AND token = 'fpIsDDl0rSCLsIZ2Mhoto67RfZ3LWuND+Wb6KPZH1+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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