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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4fe0fb5991ca9e08ded97a2e90274ae7e5482821c114952aa68e09b7eae576' 
  AND token = 'H2n/UgGIjf4QNCtscmAkwlyToexTxM5tT2SW/bqo+GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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