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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6492083f5c4675c9bfc0838457b3b62f5c62df5eda6175ccc0c25c00e7490c53' 
  AND token = '2LsExIb8l0/DO8+BOkU+2a1Fy9UrafzlsarMOqaG4rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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