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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686d8dac3a980899799b4731b9d15dc220f624969bf90b172a37dd67386bb3c1' 
  AND token = '9xKrBMoFudjmvis91hl7VYFlfDu69JRyAJ8qiPWTbps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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