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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148886587000b733a986c472ac55ab3c5906bbf6c45779c61b7eb57662ed43fc' 
  AND token = 'Oi0xppulj21tgiCfeYFUY37Zbe16YzMOsPj2b4M8pSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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