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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887e41926db4ec4a66705f09b8f35f83f504bf128ec0871ddc7e398c5c09b8f6' 
  AND token = 'daMOZYf1CKeh070OHHaifaNKN9Vc0tVWaNquetGuyNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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