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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6facf2078ad20965cc1c2ca244f8a91a03543f3c210df62f4d1388c8d2b4b854' 
  AND token = 'CG5/Qlh4jTcJzmDwmDiaJJxfd0XU7b5df6z8ha93dSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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