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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0bc82ac2f974d6da5b232b71942a89ead301715190eb9ff051ece4c89ee2cf' 
  AND token = 'QnpNxSLGzhRaNju+L5e7CXioSQeaQlt77HD0+iDSBQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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