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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93977531593a47ea24ecf37a035226d4e2ec2c7d7462790fc829f0811c613940' 
  AND token = '81oVmd/oqrfwN6pej4Rd3DykUgaeDiMk5yGDSoJKLuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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