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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0807ab255b4b17daa33d62a4ac19f87f93dee16bc33af1f1f3ea1cb6cdebdeaa' 
  AND token = '4CCG98iZtihDJDoKz1YKbJhan7drIFaJv4kUbDdl+v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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