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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fa3598106de0a7e30807d1aaa43daa7d06fcf858b11da10d95b6942382a10e' 
  AND token = '2i3fF78SyZWpVFWQazu/1ReVDrF/PqySXNaUZSvKIqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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