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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a3592e2c8015d1c011a45235179df5f4a60801949397aea297fcd5d210204b' 
  AND token = 'DJfLzsJS9JrKQeM+NbppWu096pkjU4j/rRk5eTDM/qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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