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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f6ac698f3a5c32e7e16ed922e3808609c8f98c252e52ac98b8f326cf6dc29f' 
  AND token = 'D7uTM/i6pXGk5pSA98XQiU9gjzBfPICDXkRyJNqcjGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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