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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2eb401d3cfbc934fa4b08c34b3d17c5ee2c92b99e89f413b0469a6271e2e503' 
  AND token = 'nNNh/uLH85LBsy9UGctzXi0YEkoRL65MrnNq+VN1jdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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