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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8868cf8e6c0a0c2d828d7e9f7182f115085732bb487969c7f35fc11fb20dec62' 
  AND token = 'ZEyuBpapeQsCwcfA72u3HS6L/GPxUn8JGNlBhhSyqn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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