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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82eeb858e9a294f16a80fd62c8b63448d0b5cab9264ef4075309b37c88fc6cc' 
  AND token = 'LPV8i6S5USHlTxICdYE5HKi5u0fuwiPDW0IQyAT38hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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