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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87613b23b0aa954b98dd6507f6ec7465db73a1ee85a5791fe48e8e0fd0504a7a' 
  AND token = '02AoFj0b5W6X4qTe2Dp73ajWOgYs3JaNsHrOdzHIdT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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