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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82035042fa14e40cdf0e6d5f1cf9765005dfeae6e0f5a3a2f35623668dacc6c0' 
  AND token = 'OWHSZ/n+KiQe5TjyIChuUwGfKuvKKHpVMqbdF1g6JKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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