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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857b4df2b67cfb799213bb5d5df35378b37ead7b467e0aac6218de54feecdbb3' 
  AND token = 'szaba4zaKd32TzXzMhuXat/dQ0hpyVqOJDPDYmTPnIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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