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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c12d4c5f3262ea7d56cb67e6c84363c43dc974e3554d792c4266ec0911d4ad' 
  AND token = 'aCO39VdBEIAaxUKrTG8QXjm6vsuR9+Ep5bF59V14ghM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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