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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5232c8b399be3fb762751fe1fdabac53e985ef59b55b9514fc4e4428aff6ac' 
  AND token = 'FVFFf7YtgkeFi5ovQYDKSLeQX3EcIJvAdU3zzX0Gs0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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