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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56073e41d1dd94729c339e0022379c257de9a0da609b02089e4fb9595beb2685' 
  AND token = '7ZhFUh4+namark4nI28IPhDYrl92jBXbJ4oyIFU7cng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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