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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c8a76b2bd1e18b92ee30e24c547c059e73a551bb59e7382981c0203399cc5a' 
  AND token = '3hlW6joLoIsgtQlQZz1RcNraRPsODNNJiwgNVnqQSWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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