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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b4c59f9d4126857a6244d3d0e85d84f1426ce8e0ff0507b2f0fa409483b3b2' 
  AND token = 'pIrkuRegdIw4Ic8ZkPn4zqprpTd/zyus6q5QKxUeuic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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