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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5737541078644b0b8a4c5b60aa15c93b58958aaf2a85c966959523e7131ebfc8' 
  AND token = 'WA4e3RFaXYhvy8aGRy7bB7hvjnQ93Z+DPv/zw2xxbBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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