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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24df272bd7804d9c4e25c5d9730c813415172de1004e02abbb1e74bd9bed75b9' 
  AND token = '07IZyGsmsX4FA67BNj/fHpwtugiIX5Fq2I9JhHQSaPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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