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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3d0b7b3afa283e82c9b24616f2689fce0aa52c9ad7cdfacb75c36a2b9a711e' 
  AND token = 'UZ/h8meVx63OkQ/XtKrdkGOYaH6HCXZR/uMGW6X9t38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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