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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e4d601d8597869891f743548db3e295d88ca267d9a9e962e8f2a67846aaa7e' 
  AND token = 'kwINEj9yu3SH/VLQIgNwzS5DfSNvCUbKqsli0VudzEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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