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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1bb39ca3d0d58816e4aaa0b23ef2abc1e851b08be0c917e8d9cd8c91aed3b4' 
  AND token = 'oyIRd2I8aLVoJ+jehxqOK8Jk4m533MlmwzbeX0cqYDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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