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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b0b675a91f40195a1a798db4fbdaeebd291160177d0cf3b583147c153364cb' 
  AND token = 'aQXzm4fukYe3r+9OFgEE2REPYvAncBBLpdcRPS2mHpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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