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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba76a910b6b02f9ec48a873c3744968e901c2ac62c567fbd6449c45a683efb8' 
  AND token = 'JcsmAqYMd6p2bj+Es0FPQK5C9gJOmoczJzSft5RxC4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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