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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '006091ac66872008f6f4843cb8b30f56bc1f6c8f0301e44efb9d5e8a80acade4' 
  AND token = 'AiH2/gyE4llCVrPf7bqjGZ9t4PiaTBz0gfmqH98eDqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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