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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af84cdb4c24e991285815635a309d72d88ba44eb0717c2148157a02ec5f811e' 
  AND token = 'IEexE/VyPPvjY3Dblgy+yyfNe7NtRiT9fjoOxi7Wkn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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