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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f18f02c0cc99bb1b0451fbe7e3c76d7d236429d9f80f2b2afee5403fd5db79' 
  AND token = '783njmKzeksncaKmkodsxOcZfbSjofAaoLK0dCHCCzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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