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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d95a63d6903c19c1cbd8cabcada3bfec4d6baec3c085385622e4823a3b41a3a' 
  AND token = 'feWL8fwu68mDh1CxzV2zj/8TOr1saxOJ3B8fjkj7+VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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