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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3f0ecfc40cdb045b38d4fd6dd5921872bd967a37b0097164663b5de28d7532' 
  AND token = 'vKK9mDW9axNyv7TztSaImkhzOqgNfq3NJqRNGzfctoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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