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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea4f23e329b04892dc4338eb5ea16dfb1e27e8b62c1f0b084d0f8c8e1584cfc' 
  AND token = 'SxWpNkUlIhbhkx1pm3k++QWbG/+yX5hSuARh1G/i3GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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