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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c4f3d68e6e9aa8fcd61a295205a5e7c9efcfa8e91da1db2766f870d91ddf78' 
  AND token = 'Zm2D84y88dE4gOf5s0Bmg17hV+MCuXPxtrABgaYlzPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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