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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1838522c361a0a4bfa2ee47b332e451554057f10ab604dcda144ecb8dbe925bf' 
  AND token = 'MPzUKVzdvyeOjEEnTPPWCEtFiD6NJmKUU2syVS8HWQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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