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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6332bb47f2568c6c5f204cb9b8af9639fcf3886867f8e5db3b0eb2e1ad689f' 
  AND token = '9MU1351TRs7Zyt8AsgibYM7js/+s8BZrJQwkXgpj48o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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