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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36f24792c3a335c4cb8d8b15d6a7aa9680307706d4107e43f6ee2c5ade3fef0' 
  AND token = 'H8Sl5goAWRpCJqadYybdHxQ2P6zI1G3dSBr/ulOqD0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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