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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbe9dc85376ca6973fcfe0b853880f7dd4d1fef4c6c0d120a8b47de4b3b1d93' 
  AND token = '/KbsXSWusEI63bZOhTGiuJNmIttC78IQBzPtF51SbU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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