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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991faa0ac76d2ebd46539e86793b6339a3afb6bcf29d57d3fe7d79fcd3b067a1' 
  AND token = 'NdU5Q/Q0NrEHnhvKq8QGPaxGqyH05fhZ2YUGzQGyN+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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