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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1053bbc16287fd852cb5eac3c261db3396a1c62b38d35b3273117a5accc2818' 
  AND token = '6GcFVXtjAtWiKZs8f9NztVo62FHNGGQUuYRNUoAxmOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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