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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a025a41d7b069595a5c34eb392186fca2c7dfb378a6c3d2f145377265feea5' 
  AND token = 'kcehjAW5SDxJIc9iorv+xBJX7ETn6FWJnMY6aiLLB00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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