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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa19afa25dae54f58a0dec3b827504a1cf6c2e5fef36115c20513055da5bf796' 
  AND token = 'wB656Z2vFHnKEqW7q5m6xbwtn2Zf6FkLXyjg91ShPag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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