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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fa4a05f54829cd4e7885b9df138d87a4cb42002ecc695fbe8b0ac9ebea0e3e' 
  AND token = '3GIE5esWRP/LCitjnzTy0HfBQ5G1LnxaoaxfjaK4Ixs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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