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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01417adb6c55180bb7d9aa0534d0d78e8b731f5f186d92de2610d30277d13ab' 
  AND token = 'bWp/aDBg6Hc9jnrRp32UcRc1rgsM94eL5V3bvQoNzwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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