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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d1ed4b5a98e0a4dc84066492ec41c6bf5f854b97c6211d6c4abd407c7b52fa' 
  AND token = 'MRUA6YO0iCCpzcoZsbcvFbeZbE9PmHryoS/XCUmtWl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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