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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d94e916f444d782fa9dec3b73d5151b9493602bdf7c88f46728944c51ced457' 
  AND token = 'ZV+JIURPfn9EVUqE5+q4wt+42Y3Vy+jV1tmtYCjjqV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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