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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34198577b732c749901a108e5b11bf4bee41411fc07b67f36a5e9b3e8301f46' 
  AND token = 'N3rQxKxSdgGP2AWESMpUeGGSpyR2iN3Rmb6ckDECFe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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