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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebafbd87e5871cb16f5830b0778bed444e1bac4e7415cd7618b0f7d1c21fef5' 
  AND token = '4tE/l/Ldtr+fYhSzf6Yu9ec/zGqToQX/5tGkE84SHMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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