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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31761bef054bf1c43a6d05f4a9ffd90012cc96df0d6f8838234c94fab1285bbe' 
  AND token = 'gNX5UCee6LXecNWos6Z33Fp7gv8O+TN0kjq+1l/2hSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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