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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7796f45711ae3cd71d111fcb958886984ce9f2e96e3d28e2ef7936ae97e4938a' 
  AND token = 'NMVH5ui51eRSbb9lqhrM2skYBVpOGOhQJzRDdiA3Ekw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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