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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b583f2a6e365d42a681faf5ad6377e9b0d958f824f819ba774416901cec5c8' 
  AND token = 'T5xUIlO6j9720DoU/hNpytL58SPfSUfDMlG8eTXt6CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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